Add model card

This PR ensures the model can be found at https://huggingface.co/papers/2402.18191.

README.md

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 license: apache-2.0
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+This repository contains the model of the paper [Clustering and Ranking: Diversity-preserved Instruction Selection through Expert-aligned Quality Estimation](https://huggingface.co/papers/2402.18191).
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+Github repo: https://github.com/ironbeliever/car